Web Forms :: Processing Indicator For A Long Process With File Uploads?
Jan 20, 2011
On my current project I have to accept 2 Excel spreadsheets that will be uploaded by clients, process them and create a download package based on this information. This process includes extracting data from the sheets, updating our databases and building several PDF files for the download package. This takes between 15 seconds to 2 minutes to complete, depending on the complexity of the request. Naturally, I want to show some kind of processing indicator rather than just leaving the user hanging while the page loads.
Here's the problem: How to show this processing indicator.
I have to do a full postback to upload the files so this eliminates several nice AJAX indicator methods (sponsoring users rejected the AJAX toolkit async file upload, saying it was confusing to them). If I process on any of the page events during the postback, the page doesn't load until the lengthy process is completed so the browser/site looks 'hung'.
Basically, I need some ideas on how to display a 'building your download' graphic while the lengthy process is working that will also work with a full postback.
When my Application face a long-time process, i.e fetch a query (SELECT a, b, c FROM d)This query needs 10 seconds to be completed in the MSSQL Management Studio, but when the ASP.NET application try to fetch it, it refuse to return any response to any other requests made on that Server.
I am hosting my Application on VPS Server with good specifications, and I am giving this example the (SELECT a, b, c FROM d) just to tell you the issue, it can be any process, maybe processing a movie, or even fetching some data through external API that is experiencing some slow-down,or whatever.
In part of my web page, I have couple of asp:image Thumbnails, onclick I use ajax modal popup extender to show the imgae in full size which are working fine, what I need to add is to have a processing image or indicator both in thumbnail and modal popup extender, I also have ajax autocomplete that is working fine, I need to add some indicator or processing image to it as soon as user start typing a word.
I know that similar questions have been asked all over the place, but I'm having trouble finding one that relates directly to what I'm after.
I have a website where a user uploads a data file, then that file is transformed and imported into SQL. The file could be up to 50mb in size, and some times this process can take 30 minutes or sometimes even longer.
I realise I need to palm off the actual work to another process, and poll that process on the web page. I'm wondering what the best approach would be though? Being a web developer by trade, I'm finding all this new Windows Service stuff a bit confusing, and I just wanted somewhere to start.
So:
Can I do / should I being doing this with a windows service? if so, how?
Should I use WCF? If this runs under IIS, will I have problems with aspnet_wp.exe recycling and timing out my process?
clarifications
The data is imported into sql, there's no file distribution taking place.
If there is a failure, it absolutely MUST be reported to the user. The web page will poll every, lets say, 5 seconds, from the time the async task begins, to get the 'status' of the import. Once it's finished another response will tell the page to stop polling for status updates.
queries on final decision
ok, so as I thought, it seems that a windows service is the best idea. So as to HOW to get it to work, it seems the 'put the file there and wait for the service to pick it up' idea is the generally accepted way, is there a way I can start a process run by the service, without it having to constantly be checking a database table / folder? As I said earlier, I don't have any experience with Windows Services - I wondered if I put a public method in the service, can I call it somehow?
Want to display staus of long process. when user click on button calling some function which will return the percentage of work done .I want to display that persentage in some where in the page.How can i do it?
I would like to makea windows service. whenever the user of my ASP.NET application has to do a time-consuming task, the IIS would give the task to the service which will return a token(a temporary name for the task) and in the background the service would do the task. At anytime, the user would see the status of his/her task which would be either pending in queue, processing, or completed. The service would do a fixed number of jobs in parallel, and would keep a queue for the next-incoming tasks. In addition there would be a WinForms application for system administrator that would allow adding special ADMIn tasks such as "Clean orphaned files" or "archive data of inactive users".
Can you point me to something that can jump start me on this as a whole concept - I know I can google for windows services and I am able to do it myself from scratch but time is of the Essence so maybe you know of something that is already there and i can use block to build out of.
I have a page currently setup to upload 1 image at a time, it uploaded the image, then creates a thumbnail for that image in the same directory. Client needs / wants to be able to upload a few more images at the same time. So i would like to see if i can use the existing code that works, but setup to upload a few more images and process them all to create the thumbnails.
I currently have a page that allows them to upload 5 images at a time and that works fine, but its just simple uploading the images, nothing else is happening at that moment.
I have an asp.net page that will be doing some processing that may take a very long time to complete. I cannot just set the page timeout value since this is going to be in a hosted environment and the timeout values that I set in my web.config are overridden by the server host. What I'm doing is taking a file from a FileUpload control and doing some web requests to a 3rd party service for each line in the file, all of which may take a very long time to process a large file. I'm talking on the order of, say, 30 minutes, and there's just no way to optimize this any further to cut down on the processing time. Is it possible to even do such a lengthy page request in asp.net? Can someone give me a pointer in the right direction here to make this happen? Is my only hope to create an async page? It seems that doing an async page is the way to go if I have a potential for a lot of lengthy requests, but really this massive of a request is going to happen VERY rarely so this is not an issue of running out of thread pool since most of the time this particular request will be completed relatively quickly, but on occasion it may receive a very large file it will need to process and will take a very long time. So what is the best way to handle that case?I'd also like to update the client with the processing status as the processing is going on. I'm familiar with doing client ajax calls via jQuery to a page webmethod so if there is some clean way to update the client as this long processing
i have a web application which which proccesses some request on some data that client selects, when the client selects more than 20 objects and clicks on proceed the client recieves this error, because the server takes a long time to process, however if the records are less and hence a timely response is recieved, no such error comes?
i have increased the sessiontimeout as well as set the
i'm developing a web application using asp.net 3.5 sp1, my issue is , i need to upload multiple files asynchronously.
for that i used the ajax control toolkit "async file upload", where i can only upload single file and cannot track the filenames after uploading, so i go for the "file uploaded ajax"
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when i started including the cascading dropdown in that page("mainpage.aspx") , an error occured in the page, ie; when i click add files of the "file upload ajax", the "file upload" control some times doesnot show, so i created another page("testpage.aspx") and included the "file upload" control in that page and created an iframe in the "mainpage.aspx" and call the "testpage.aspx", now it is working fine, but i was not able to track the filename, can i access the control inside that iframe from the "mainpage.aspx" ?
I have an asp.net page that calls a dll that will start a long process that updates product information. As the process is running, I want to provide the user with constant updates on which product that process is on and the status of the products. I've been having trouble getting this to work. I add information to a log text file and I was thinking that I'd redirect to a new page and have that page use Javascript to read from the text file every few seconds. My question is has anyone else tried this and does it work fairly well?
In an asp.net web form, I keep getting a connection reset error message. The page is doing a some long running processing (about 2-5 minutes).
I have no problem when the web request comes from the same machine as the web server. But when the request originates across the network, I get a connection reset error about 1:30 or 2 minutes into waiting for a response.
I have set the in web.config for this application and put the application it's own application pool.
What else can I try?
Edit
The purpose of this page is to accept input from the user, calculate something, and send the result back to them. The long running calculation isn't something I can offload until a later time.
I've developed a popup email .aspx used on our intranet based web app that is auto generated with .pdf's attached. I'm developing with VS 2008 ASP.Net 3.5 C# and System.Net.Mail.MailMessage. I can create and send the email with no issues. The problem is with any attempt to open or delete the attachments I get the above error. The .pdf's a copied with the following code:
FileStream fsr = new FileStream(inFilename, FileMode.Open, FileAccess.Read, FileShare.Read); BinaryReader reader = new BinaryReader(fsr); byte[] bytes = new byte[fsr.Length]; reader.Read(bytes, 0, bytes.Length); FileStream fsw = new FileStream(outFileName, FileMode.Create, FileAccess.Write, FileShare.Write); BinaryWriter writer = new BinaryWriter(fsw); writer.Write(bytes, 0, bytes.Length); // clean up writer.Flush(); writer.Close(); writer = null; fsw.Close(); fsw.Dispose(); fsw = null; reader.Close(); reader = null; fsr.Close(); fsr.Dispose(); fsr = null; Later after sending the email I: mailMessage.Dispose(); mailMessage = null; foreach (string fileName in attachments) { if (File.Exists(fileName)) File.Delete(fileName); }
The error occurs at: the File.Delete(fileName);
how I can delete or reopen these files after sending the email?
Note:- i don't want to use updateprogress etc. control of ajax
on button click, long task(e.g thread) runs in my webpage for about 4-5 minutes.I want to show status to user either by a processing image through javascript(image must be shown in a certain part of page other part of page will remain intact) or an exact status of process if possible. i have tried a lot but all in vein.
Situation:I have an ASP .NET application that will search through docs using Lucene. I want to run the initial indexing (the index will be incremental after the initial run so there wont be need to index the whole directory again in future). Currently, I have about 5GB of docs (45000files).Problem: My application times out before completing the process. I have altered the TimeOut like this:HttpContext.Current.Server.ScriptTimeout = 200000;but it still does not complete the process.
I've asked this before but I was hoping for another answer and perhaps some code samples because I've been having a difficult time with this. I have an asp.net page. The user hits the "Run" button and I have code IN AN ASSEMBLY, not in the APP_CODE folder that is called and runs a long process that moves product info from a file into the database. While the user waits, I would like them to see status updates like what product the import process in on and status info. I'm assuming I'd break off into another thread and use Ajax but I have no idea how to do this.
I need to do multiple file uploads in my ASP.NET page. I also have to display a progress bar with the status of the file transfer. It should display an all file progress status bar separately and a total in a separate progress bar until the file upload has finished.
I've been having a difficult time with this. I have an asp.net page. The user hits the "Run" button and I have code IN AN ASSEMBLY, not in the APP_CODE folder that is called and runs a long process that moves product info from a file into the database. While the user waits, I would like them to see status updates like what product the import process in on and status info. I'm assuming I'd break off into another thread and use Ajax but I have no idea how to do this.
Wondering if there is a performance difference between letting a long running process hang in asp.net vs running the process via a windows service. I have done this once before and the windows service was much quicker and didnt bog down my system, whereas the asp.net request seemed to wreak havoc.
